Specification: Maximum Pressure: 80 psi,SUGGESTED WORK PRESSURE: UNDER 50 PSI , Temperature:40-110°F/5-45°C , Shelf life: 5 Years. Note: 1. Please lubricate the o-ring with silicon grease and use wrench provided to prevent leakage. you may search «whole house water filter » on YouTube, there is some video about this housing, it is very helpful if it is the first time to install it. 2. Protect filter housing from freezing. 3. This filter housing has a maximum operating pressure rating of 80 psi, if you suspect that your water pressure will at any time exceed 60 psi, a pressure regulator MUST BE INSTALLED before the filter housing. this action will guard against the water pressure exceeding the maximum pressure rating.it is recommended that the pressure regulator be set at 50 psi or less. 4. The rubber o-ring provides the water tight seal between the cap and the sump. it is important that the o-ring be properly SEATED IN THE GROOVE of a water leak could occur. Features: Pure Water for Whole House 2 Stage Geekpure Whole House Water Filter System is installed at the main water supply and produce pure water for your entire home. Enjoy better water from every tap and every appliance in the whole house. Flow rate:5-15 GPM (depend on feed water pressure.) PP Sediment Filter PP Sediment is used to remove silt, sand, rust, dirt, and other undissolved particles,The PP filter display different color and tracks the life time as you use,It is time to replace a new one when it is dark yellow or brown. Life time:6-12 months or 100 K gallons (Depends on Usage Amount and Feed Water Quality) . Carbon block filter Carbon block filter is used to remove chlorine, taste & odors,rust and very fine particulates. Life time:6-12 months or 100 K gallons (Depends on Usage Amount and Feed Water Quality) . Flow rate:5-15 GPM (depend on feed water pressure.) More valuable information: 1. What is dimension of the big CLEAR housing and filters ? ANSWER: It is standard sized 4.5″ OD x 20″ height filters and housings . 2. What is in the box? ANSWER: 2 x 20 inch big clear housing with pressure release , 2 x plastic wrench ,2 x metal bracket.2 bags screws,1 x PP sediment filter, 1 x carbon block filter. 3.What is filters options? ANSWER: 1.PP spun filter, Remove sand, dirt, sediment. life time:6 months. 2.Granular activited carbon filter, Remove chlorine, taste & odors, very fine particulates. life time:6months. 3.Carbon block filter, Further remove chlorine, taste & odors, very fine particulates. life time:6 months.